Before joining SDU, I was a Humboldt Fellow at Lehrstuhl D für Mathematik of RWTH Aachen from 2017 to 2019, hosted by Prof. Gabriele Nebe. (I was also here from 2014 to 2015.) From 2015 to 2017, I was a postdoc at Department of EE – Systems of Tel Aviv University, working with Prof. Ofer Shayevitz. From 2009 to 2014, I was a PhD student at Department of Mathematics of Zhejiang University, advised by Prof. Gennian Ge.